/*
 * Copyright 2013-2018 Lilinfeng.
 *  
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *  
 *      http://www.apache.org/licenses/LICENSE-2.0
 *  
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.phei.netty.protocol.udp;

import static io.netty.util.CharsetUtil.UTF_8;

import io.netty.bootstrap.Bootstrap;
import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.channel.Channel;
import io.netty.channel.ChannelOption;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.DatagramPacket;
import io.netty.channel.socket.nio.NioDatagramChannel;

import java.net.InetSocketAddress;

/**
 * @author lilinfeng
 * @date 2014年2月14日
 * @version 1.0
 */
public class ChineseProverbClient {

	public void run(int port) throws Exception {
		EventLoopGroup group = new NioEventLoopGroup();
		try {
			Bootstrap b = new Bootstrap();
			b.group(group)
				.channel(NioDatagramChannel.class)
				.option(ChannelOption.SO_BROADCAST, true)
				.handler(new ChineseProverbClientHandler());
			
			Channel ch = b.bind(0).sync().channel();
			// 向网段内的所有机器广播UDP消息
			ByteBuf data = Unpooled.copiedBuffer("谚语字典查询?", UTF_8);
			DatagramPacket packet = new DatagramPacket(data,new InetSocketAddress("255.255.255.255", port));
			ch.writeAndFlush(packet).sync();
			if (!ch.closeFuture().await(15000)) {
				System.out.println("查询超时!");
			}
		} finally {
			group.shutdownGracefully();
		}
	}

	public static void main(String[] args) throws Exception {
		int port = 8080;
		if (args.length > 0) {
			try {
				port = Integer.parseInt(args[0]);
			} catch (NumberFormatException e) {
				e.printStackTrace();
			}
		}
		new ChineseProverbClient().run(port);
	}
}
